Polarization-Controlled Two-Dimensional White-Light Spectroscopy of Semiconducting Carbon Nanotube Thin Films
| Autor: | Padma Gopalan, Michael S. Arnold, Randy D. Mehlenbacher, Yongho Joo, Nicholas M. Kearns, Thomas J. McDonough, Martin T. Zanni, Matthew J. Shea |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
Doping Analytical chemistry 02 engineering and technology Electronic structure Carbon nanotube Condensed Matter::Mesoscopic Systems and Quantum Hall Effect 010402 general chemistry 021001 nanoscience & nanotechnology Polarization (waves) 01 natural sciences Molecular physics 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials law.invention Condensed Matter::Materials Science Dipole General Energy law Physical and Theoretical Chemistry Thin film Trion 0210 nano-technology Spectroscopy |
| Zdroj: | The Journal of Physical Chemistry C. 120:17069-17080 |
| ISSN: | 1932-7455 1932-7447 |
| Popis: | Polarized two-dimensional white-light (2D-WL) spectra are reported for thin films of semiconducting carbon nanotubes. The orientational responses for 4-point correlation functions are derived for samples that are isotropic in two dimensions. Spectra measured using ⟨−45°,+45°,0°,90°⟩ polarizations eliminate the diagonal peaks in the spectra arising from S1 transitions to uncover cross peaks to a weaker transition that is assigned to radial breathing modes. In nanotubes purified by unwrapping PFO-BPY polymer using metal chelation, an absorption at 1160 nm is observed that is assigned to hole doping that forms trions. The trion peak may have a transition dipole nonparallel to the S1 transitions, and so its cross peak is prominent in polarized 2D-WL spectra. Energy transfer of photoexcitons to the trion peak occurs within 1 ps. Identifying and understanding the effects of purification on the electronic structure of thin films of semiconducting carbon nanotubes is important for learning how the inherent photop... |
| Databáze: | OpenAIRE |
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